Improvement in gas-checks for revolving fire-arms



1. D Avse.

improvement in Gas-Check for RevolvingFre-Arms. 940.132,35?.

Patented Oct. 22,1872.

WTNESSS.

fr f y NITnn STATES PATENT JOSHUA DAVIS, OF LIMESTONEVILLE,PENNSYLVANIA.

IMPROVEMENT IN GAS-CHECKS FOR REVLVING FIRERMS.

Specification forming part of Letters Patent No. 132,35*?dated October22, 1872.

To all whom it may concern:

Beit known that I, JOSHUA DAVIS, of Limestoneville, in the county ofMontour and State of Pennsylvania, have invented certain Improvements inRevolving Fire-Arms, of lwhich the following is a description: v

In the accompanying drawing, Figure l is a front-end view of thecylinderof my improved lire-arm; Fig. 2 is a side view of the part of a lire-armembodying my invention, showing the position of parts at the moment ofdischarge; Fig. 3 is also a side view, showing the position of partsprevious to the discharge; Fig. 4 is a perspective view of the rear endof the barrel; Fig. 5 is a rear-end view of the frame in front of thecylinder; and Figs. 6, 7, 8, and 9 represent details.

My invention has relation to revolving lirearms; and it consists, rst,in the construction and novel arrangement of the lbarrel, socket, frame,and cylinder, as hereinafter described, whereby the escape of gasesbetween the rear end of the barrel and a chamber of the cylinder whenthe fire-arm is discharged is prevented, and the velocity of the ballconsequently increased; second, in the construction and novelarrangement of the barrel, cylinder, socket, and frame whereby thesocket, after being moved by the discharge of the fire-arm, isautomaticallyr replaced 4and the cylinder allowed to be turned withoutthe friction otherwise consequent.

Referring to the accompanying drawing, A represents the rear end of thebarrel reamed out, as shown at a, Fig. 4, to a thin edge at the exteriorsurface to render it elastic and allow it to press tightly against theinterior surface of the socket C, when the latter is moved by the forceof the gases. b b represent slits in the part a to allow the latter toexpand. c d represent grooves cut around the surface of the barrel, asshown. The purpose of the groove d is to prevent the banking of dirt orresiduum, the same being fractured as it accumulates by the concussionof the forward end of the socket C, when the same moves forward from theposition shown in Fig. 2 to that shown in Fig. l. The groove c isdesigned, in connection with the groovet' in the interior surface of thesocket C, to prevent the rear end and exterior surface of the barrelfrom adhering to the interior surface of the socket. As shown in Fig. 3,the groove 'i is forward of the groove c, this being the position beforethe discharge of the arm. Thus the exterior surface of the rear end ofthe barrel touches the interior surface of the socket the distance onlyfrom the groove d to the edge of the concave part a less the width ofthe two grooves c and c', but at the moment of discharge, when thesocket moves backward, as shown in Fig. 3, the groovesI i c are made tocoincide, increasing the extent of contact surface of the barrel andsocket the width of one groove, thereby making a tighter joint. Thesocket Gis provided with a flange, e, against which the gases press tomove the socket back against the face of the cylinder D. The socket isalso provided with lateral projections or studs h h, tting recesses o inthe surface of the frame B and serving to prevent the socket fromturning as it moves forward and backward. The diameter of the interioredge of the flange c or rear end of the socket O may be made the same asthe caliber of the barrel and cylinder chambers, but I prefer to havethe diameter of said flange labout one-fiftieth of an inch larger..Between the inner edge of said flange and the irregular lines f liesthe surface of the socket, which, by pressing against the' surface ofthe cylinder, prevents Ythe escape of gases at that point,

and also covers the grooves a: fc a' and holes g g g in the surface ofthe cylinder at the moment of discharge. Outside the irregular linesfthe surface of the socket is beveled to pre vent the residuum fromadhering to it. The holes shown at g g g are designed to receive gassuiiicient to move the socket forward after the discharge. These. holesare far enough away from each respective chamber to prevent theirimpairing the strength of the cylinder. The grooves cc cc x are for thepurpose of conducting the gas to the holes g g g. It is obvious that theholes g g may be made in the socket linstead of the cylinder.

Now, supposing the firearmv having the herein-described improvements bedischarged properly and in the usual way, the result is a suddenconversion of the charge into gases. These gases, after the ball haspassed the rear end of the barrel, expand the concave part a while theslits b are choked or closed by the dirt and residuum getting betweenthe con- Triton..V

tiguous surfaces of the socket and barrel. The pressure of the gasesalso upon the lange e forces the socket back against the face ofthecylinder, preventing the gases from escaping at that point and closingthe holes g and grooves w, the same having been illed with gas. As soonas the ball leaves the muzzle of the barrel the pressure of the gasceases, except that within the holes which now moves the socket back toits original position.

What I claim as new, and desire to secure by Letters Patent, is-

l. The cylinder D having the holes g and grooves cv, in combination withthe slidingsocket C and barrel A, substantiall)T as specied.

2. The barrel A having its end reamed n and slit, as shown at a b, incombination with the movable socket C, substantially as described.

3. The barrel A having the grooves c d in combination with the movablesocket C having the internal groove i', substantially as described.

4. The combination of the barrel A, movable socket C, frame B, andcylinder D, substantially as described.

JOSHUA DAVIS.

Witnesses:

HENRY KAIsER, EDM. F. BROWN.

